Billboard display apparatus



FIG. 1 is a perspective view of a billboard display apparatus, showing our new design;

FIG. 2 is a front elevational view, the rear elevation being identical thereto;

FIG. 3 is a left side elevational view, the right side being identical thereto;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a perspective view thereof, shown with the arms retracted. 

The ornamental design for the billboard display apparatus, as shown and described. 